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I too use these for my 14' Achilles inflatable dinghy and other Zodiacs over the years.
Make sure you buy the LED type instead of the less expensive incandescent bulb type.
Being that you only use them sparingly the LED will much better work and your batteries stay good longer.
Happy boating 1 hr B-4 sunset and 1 hour after sunup are the nav lights required, not just when it is dark.